Let me start by saying I am not a techie but I am a person who likes to save money. Skype and gizmo are technology that allow people to use the internet to make calls for free or really cheaply to places around the world. They pretty, much work the same ways and have similar features. Skype is more popular but Gizmo was recently acquired by Google to enhance it’s Google Voice so I’m sure Gizmo will increase in popularity soon. A good thing about Gizmo is that it doens’t charge connection fees when people make phone calls and it uses technology that allows it to work with regular phone technolgy while Skype uses proprietary protocols.